Which of the following is a thermosetting polymer?

Options

A. PVC
B. Neoprene
C. Bakelite
D. Polythene

Answer

To determine which of the following is a thermosetting polymer, we can analyze the options provided in the context of their properties and structures.

### Step-by-Step Solution:

1. **Understanding Thermosetting vs. Thermoplastic Polymers**:
- Thermoplastic polymers can be melted and reshaped multiple times without undergoing any significant chemical change. They have linear or branched structures.
- Thermosetting polymers, on the other hand, undergo a chemical change when they are heated and set into a rigid structure. Once set, they cannot be remolded or reshaped.

2. **Identifying the Given Polymers**:
- The question mentions several polymers: neoprene, bakelite, and polyethylene.

3. **Analyzing Neoprene**:
- Neoprene is a type of synthetic rubber made from the polymerization of chloroprene. It is flexible and can be reshaped, which indicates it is a thermoplastic.

4. **Analyzing Bakelite**:
- Bakelite is formed from the polymerization of phenol and formaldehyde. It results in a three-dimensional cross-linked structure that is rigid and cannot be remolded once set. This indicates that bakelite is a thermosetting polymer.

5. **Analyzing Polyethylene**:
- Polyethylene is made from the polymerization of ethylene (CH2=CH2). It is also a thermoplastic because it can be melted and reshaped.

6. **Conclusion**:
- Among the options provided, **Bakelite** is the only thermosetting polymer.

### Final Answer:
**Bakelite is a thermosetting polymer.**

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